I just finished Love The One You're With By Emily Giffin. While it isn't as good as her other books (i.e. Something Borrowed and Something Blue) it is still a great book. It begins when a women runs into an old boyfriend in the middle of NYC leaving her wondering if she made the right decision by choosing her husband.
I highly recommend everyone read it!
Chick Lit Challenge can be found http://chicklitplus.com/chick-lit-reading-challenge-2011/
The 2011 TBR Challenge can be found http://readerchallenges.wordpress.com/2011-tbr-lite/